\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\begin{document}
\small
\begin{tikzpicture}[>=latex,scale=1]
  \node at (0,0){\sun};
  \node at (-.5,0){$S$};
  \draw[dashed] (0,0)--(15:2)node[above]{$A$};
  \draw[dashed] (0,0)--(-15:2)node[below]{$C$};
  \draw[->](15:2)--(15:3.5)node[above]{$B$};
  \draw[->](-15:2)--(-15:3.5)node[below]{$D$};
\end{tikzpicture}
\end{document}